10 Best Rooftop Cargo Boxes 2026 in the United States

The Thule Motion 3 XXL Low is a great choice if you need a large rooftop cargo box with plenty of storage space, offering 18 cubic feet of volume. Its wing-shaped, forward-leaning design helps reduce wind drag, which can improve your car’s fuel efficiency during travel. The box is made from aluminum, making it sturdy and durable, though it is not water resistant, so it might not fully protect your belongings in heavy rain.

Weighing 25.4 kilograms, it’s on the heavier side but still manageable considering its size. Mounting the box is straightforward thanks to Thule’s PowerClick system, which gives a clear click when securely attached, making setup fast and secure without extra hassle. The wide handle allows you to open and close the lid smoothly with one hand, and the SlideLock system provides good security by locking the lid automatically and showing when it’s safely closed.

Optional accessories like an interior light and protective liners add convenience but come separately. This cargo box suits those who want a spacious, well-designed carrier that balances easy handling with secure attachment. However, if you frequently drive in wet conditions, you might want to consider a fully waterproof model.

The Thule Motion 3 XXL rooftop cargo box is an excellent choice for those needing a large, durable storage solution for road trips or outdoor gear. It offers a roomy 21 cubic feet of space, capable of carrying up to 165 pounds, which makes it suitable for bulky items like camping equipment or luggage. The aluminum construction provides strength and a premium feel, although it is not fully water resistant, so it is best suited for dry or light weather conditions.

Its aerodynamic, wing-shaped design helps reduce wind drag, potentially improving fuel efficiency compared to boxier models. Mounting the box is hassle-free thanks to the PowerClick quick-mount system, which signals when the box is securely attached, offering a tool-free setup that is convenient for occasional users. The lid opens and closes smoothly with one hand, aided by a wide handle, simplifying loading and unloading. Security is enhanced with the SlideLock system that locks the lid tightly and clearly indicates when it’s secured, providing peace of mind when leaving your vehicle unattended.

Additional features such as optional interior lighting and protective liners enhance usability but may increase the overall cost. The cargo box is relatively heavy (about 35 kg), which may make installation challenging for one person. While it does not offer full water resistance, it is solidly built and comes with a limited lifetime warranty. This rooftop carrier is ideal for travelers and families seeking a spacious, secure, and sleek storage solution with easy mounting and access; however, those frequently driving in heavy rain or requiring complete waterproofing might prefer other options.

The SportRack Vista XL Rear Opening Cargo Box is a spacious rooftop cargo box with an internal capacity of 18 cubic feet (510 liters), making it suitable for large families or individuals needing extra storage for trips. Its maximum weight capacity is 100 pounds (45 kg), which should suffice for most typical luggage. The cargo box is made from durable, UV-resistant ABS material, providing longevity and resistance against the elements. Its rear opening design makes accessing items easy and safer, as you don't have to be near traffic when opening it.

The tool-free mounting hardware simplifies installation and removal, making it user-friendly for those who may not be technically inclined. Additionally, the cargo box includes a key and lock system to secure contents and prevent theft, adding a layer of security for peace of mind. It fits various rack systems, including square, round, and most factory racks, ensuring versatility in mounting options.

The aerodynamics of the box are not explicitly mentioned, but the streamlined shape likely contributes to reduced wind resistance and noise. However, users should be aware of the dimensions (63 x 38 x 19 inches) and ensure their vehicle can accommodate its size without obstructing other functions or visibility. At 28 pounds, it's relatively lightweight but sturdy. This cargo box is an excellent choice for those seeking a durable, spacious, and secure storage solution for their vehicle.